This is a great question! I likey.

I'll give you a whole big thingy later but the short answer is...

1. Sucking in your abs during ab movements can contribute to flattening..through strengthening the TVA which essentially helps "pull in" the abdominal wall. But it will not help with symmetry to my knowledge and since the rectus is ONE BIG MUSCE...if appears uneven it would seem to me it's gonna stay that way.

2. Unless your Australian ..sucking in your abs should ONLY be recommended during "ab movements" and NEVER during squats and such..such as Paul Chek recommends.\

3. Abs that are cut but "stick out" as if you have a cut up beer belly are a side-effect of faulty bb training. There is also a phenomenom called GH gut but lots of people can get this affliction to some extent through faulty training without ever taking any GH. This can be corrected through good core training.

There is an article by Mike Robertson which addresses this very technique and I will link that later.

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If you act sanctimonious I will just list out your logical fallacies until you get pissed off and spew blasphemous remarks.